EP2321069A1 - Procédé de revêtement d un substrat en acier, et substrat en acier recouvert - Google Patents

Procédé de revêtement d un substrat en acier, et substrat en acier recouvert

Info

Publication number
EP2321069A1
EP2321069A1 EP09772154A EP09772154A EP2321069A1 EP 2321069 A1 EP2321069 A1 EP 2321069A1 EP 09772154 A EP09772154 A EP 09772154A EP 09772154 A EP09772154 A EP 09772154A EP 2321069 A1 EP2321069 A1 EP 2321069A1
Authority
EP
European Patent Office
Prior art keywords
lubricant
paint
dry film
steel
steel substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09772154A
Other languages
German (de)
English (en)
Other versions
EP2321069B1 (fr
Inventor
Laurence Véronique Yvonne GUIO
Martin Simon Brunnock
Neil Mathieson Craik
Vernon John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tata Steel UK Ltd
Original Assignee
Tata Steel UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tata Steel UK Ltd filed Critical Tata Steel UK Ltd
Priority to EP09772154.2A priority Critical patent/EP2321069B1/fr
Publication of EP2321069A1 publication Critical patent/EP2321069A1/fr
Application granted granted Critical
Publication of EP2321069B1 publication Critical patent/EP2321069B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding

Definitions

  • the invention relates to a method for coating a steel substrate, wherein pickled hot rolled steel strip, cold rolled steel strip or zinc-coated steel strip - hereafter referred to as steel strip material, has been provided with a lubricant for corrosion protection before shipping and wherein the lubricated strip material is worked and/or formed to manufacture the steel substrate, and before and/or after the working and/or forming the steel substrate is coated with a paint system.
  • the invention also relates to a coated steel substrate.
  • Lubricants in general have to be removed by degreasing and the substrate has to be pre-treated, before a paint system can be applied to or on the substrate.
  • a lubricant has not been removed or the substrate has not been pre-treated, this results in a poor quality of the painted product, meaning that the paint adheres badly to the substrate.
  • Such products are commercially unacceptable.
  • the inventors have found that it is possible to paint steel substrates without removing the lubricant, which is always applied as corrosion protection, when certain lubricants are used.
  • the adhesion of the paint on the substrate is at least as good as when the lubricant has been removed.
  • the standard procedure to remove the lubricant or to pre-treat the steel substrate by using hazardous degrease or pre-treatment chemicals can thus be omitted, which on the one hand makes the method both cheaper and faster, because the method is easier, and on the other hand improves the environmental position of the overall painting procedure.
  • the lubricant that is used is a dry film lubricant. It has been found that dry film lubricants can provide the adhesion that is necessary for the paint systems used.
  • the dry film lubricant preferably contains ester-based polymers and/or ester- based organic molecules and/or saturated hydrocarbons and/or unsaturated hydrocarbons and/or viscosity modifiers and/or corrosion prevention additives.
  • the dry film lubricants containing one or more of the above constituents have shown it is possible to use paint systems without removing the dry film lubricant.
  • the dry film lubricant contains a mixture of aliphatic hydrocarbons and saturated esters. This mixture has shown to give an adhesion of the paint on the substrate while the dry film lubricants remains on the substrate, that is as good as when the lubricant has been removed.
  • the steel substrate is used for purposes outside the automotive sector.
  • Such purposes encompass all types of industrial products including furniture for office and household use, such as filing cabinets, shelving for outlets and drum manufacture.
  • the lubricant or dry film lubricant has been applied to the steel strip material at a coating weight of 0.3 - 3.0 g/m 2 .
  • a coating weight lower than 0.3 g/m 2 the corrosion protection is too low; with a coating weight above 3.0 g/m 2 the adhesion of the paint to the substrate is believed to diminish.
  • the coating weight is between 0.5 g/m 2 and 2.0 g/m 2 .
  • the lubricant or dry film lubricant has been applied at speeds between 20 and 600 m/min. Speeds lower than 20 m/min are not economical; speeds higher than 600 m/min are technically difficult to realise. A preferred range is a speed between 100 and 300 m/min, which is economically viable.
  • the lubricant or dry film lubricant has been applied using an electrostatic oiler or using hot melt application technology or through the use of a high speed coating technique such as a chemcoater or spray disk process.
  • a high speed coating technique such as a chemcoater or spray disk process.
  • the paint system that is used in the method described above preferably is in liquid form or in powder form, which paint system preferably is a derivate of phenolics, acrylics, esters, urethanes or epoxies, and mixtures thereof.
  • paint (or lacquer) systems are in wide use for the coating of steel substrates, and these paint systems are perfectly suitable for coating steel substrates on the surface of which the lubricant remains present.
  • An example of a mixture is a combination of a polyester and an epoxy phenolic.
  • the liquid paint is applied through roller coating, curtain coating, spray disk coating and derivates thereof.
  • Such application techniques are known in the art, and have proven to be suitable to apply the liquid paint systems mentioned above on a steel substrate on which the lubricant remains present.
  • the powder paint is a thermosetting paint or a thermoplastic paint, and is preferably applied through use of an electrostatic gun.
  • Such powder paint systems are known in the art, and their application methods as well.
  • the lubricated steel substrate that has been coated with a paint system is cured, preferably within the temperature range of 140 - 250° C for up to 1 - 15 minutes. It has been found that such curing temperatures and periods are suitable for paint systems as mentioned above that are applied on a steel substrate with the lubricant remaining on it.
  • the curing of the paint is preferably performed using a gas fired oven, an infrared oven, a near infra-red oven, an electron beam unit or an induction oven.
  • a gas fired oven an infrared oven, a near infra-red oven, an electron beam unit or an induction oven.
  • Such equipment is known in the art and all are suitable for a paint on a steel substrate with lubricant.
  • the paint before curing has a thickness between 30 and 120 microns, preferably between 50 and 90 microns. These are thicknesses for which the paint can accommodate the lubricant or dry film lubricant.
  • a steel substrate produced in accordance with the method described above, wherein the substrate has been provided with a coating comprising a lubricant and a paint.
  • the substrate has been worked/formed for purposes outside the automotive sector.
  • Such purposes are for instance office furniture and shelving.
  • the invention will now be elucidated with reference to a number of trials performed using the method described above and the resulting coated steel substrates.
  • substrates have been provided with a dry film lubricant and these substrates have been coated with paint systems.
  • the painted substrates have been tested to assess the adhesion performance.
  • the substrate used was a cold reduced, annealed and temper rolled steel strip having a gauge between 0.62 and 0.78 mm and a width between 902 and 1240 mm.
  • the steel used for these trials was DCOl material. It will be understood by the person skilled in the art that other gauges and width can be used as well; it is known to supply strip in thicknesses in the range of 0.3 mm to 2.2 mm and width in the range of 500 to 2000 mm.
  • the dry film lubricant has been heated to a maximum temperature of approximately 85 0 C before it has been applied, so it will have had a temperature of approximately 70 0 C when it was applied on the steel strip.
  • the speed of the strip during application of the dry film lubricant has been up to 100 m/min. In another trial, the speed of the strip during the application of the dry film lubricant has been up to 250 m/min.
  • the steel strip itself has had a temperature of approximately 15 0 C before the dry film lubricant has been applied.
  • the dry film lubricant has been applied using an electrostatic oiler.
  • the electrostatic oiler has run with a blade gap typically between 75- 200 microns.
  • the dry film lubricant used is a hot melt containing, amongst other ingredients, ester based organic molecules, ester based polymers and unsaturated hydrocarbons
  • ester based organic molecules containing, amongst other ingredients, ester based organic molecules, ester based polymers and unsaturated hydrocarbons
  • Trial 1 0.1 to 1.0 g/m 2 dry film lubricant
  • Trial 3 0.5 to 2.5 g/m 2 dry film lubricant. It has been found that the difference in performance between the various thicknesses of the dry film lubricant are small, but that a thickness of 1.0, 1.5 and 2.0 g/m 2 per side of the substrate generated better results in the laboratory adhesion tests compared to tests of the same paint on the same substrate when the dry film lubricant had been removed. It also became clear that a curing temperature of the paint coating of 180 - 200 0 C for a dry film lubricant of 1.0 g/m 2 provided better adhesion test results compared to tests of the same paint on the same substrate when the dry film lubricant had been removed.
  • the result of the tests thus is that it is possible to use a dry film lubricant on a steel substrate that remains present on the substrate when coated with a paint system, without loss of quality of the adhesion of the coating.
  • the method used involved heating up the samples to 180°C at 10°C/min (to determine melting point), keeping at 180°C for 10 min (curing), subsequent quenching and reheating to 180°C at 10°C/min, to determine the glass transition temperature (Tg) of the cured coating.
  • a dry mixture of about 10% dry film lubricant with one powder gave, after curing, a Tg that was lowered by approximately 12°C compared to the pure system. Further to this, a drop in Tg of approximately 13 0 C was observed with a second powder. This indicates a notable 'plasticising 1 effect, which in turn means good mixing and specific interactions between dry film lubricant and coating resin. With a third powder no clear Tg was visible after mixing with the dry film lubricant, only a little indistinct peak around 48 - 50 0 C. This can be the Tg, in which case there would be a substantial plasticising versus the powders on their own (Tg of 61 - 65°C).
  • dry film lubricant and powder coatings will mix in the liquid state during curing, due to a broad overlap in the temperature ranges over which they are in all the liquid phase.
  • the dry film lubricants have a liquid state starting at approximately 4O 0 C.
  • the dry film lubricants are applied at temperatures around 60 - 80 0 C.
  • components of the dry film lubricant for example, unsaturated molecules, undergo co-polymerisation reactions with the powder paint.
  • the unsaturated hydrocarbons in the dry film lubricant can co-polymerize with the powder.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

La présente invention se rapporte à un procédé servant à recouvrir un substrat en acier. Un matériau de bande d’acier laminé à chaud décapant, de bande d’acier laminé à froid ou de bande d’acier recouvert de zinc a reçu un lubrifiant pour protection contre la corrosion avant expédition et/ou stockage, et le matériau en bande lubrifié est usiné et/ou façonné pour fabriquer le substrat en acier. Avant et/ou après l’usinage et/ou le façonnage, le substrat en acier est recouvert à l’aide d’un système à peinture. Selon l’invention, le substrat en acier est recouvert tandis que le lubrifiant reste sur l’acier. L’invention se rapporte également à un substrat en acier produit conformément au procédé de l’invention, le substrat ayant reçu un revêtement comprenant un lubrifiant et une peinture.
EP09772154.2A 2008-07-04 2009-07-01 Procédé de revêtement d un substrat en acier, et substrat en acier recouvert Active EP2321069B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09772154.2A EP2321069B1 (fr) 2008-07-04 2009-07-01 Procédé de revêtement d un substrat en acier, et substrat en acier recouvert

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP08104645 2008-07-04
US7851508P 2008-07-07 2008-07-07
EP08017591 2008-10-07
PCT/EP2009/004743 WO2010000454A1 (fr) 2008-07-04 2009-07-01 Procédé de revêtement d’un substrat en acier, et substrat en acier recouvert
EP09772154.2A EP2321069B1 (fr) 2008-07-04 2009-07-01 Procédé de revêtement d un substrat en acier, et substrat en acier recouvert

Publications (2)

Publication Number Publication Date
EP2321069A1 true EP2321069A1 (fr) 2011-05-18
EP2321069B1 EP2321069B1 (fr) 2017-11-01

Family

ID=41109313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09772154.2A Active EP2321069B1 (fr) 2008-07-04 2009-07-01 Procédé de revêtement d un substrat en acier, et substrat en acier recouvert

Country Status (4)

Country Link
EP (1) EP2321069B1 (fr)
ES (1) ES2647563T3 (fr)
WO (1) WO2010000454A1 (fr)
ZA (1) ZA201100323B (fr)

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US11259924B2 (en) 2006-12-05 2022-03-01 Valtech Cardio Ltd. Implantation of repair devices in the heart
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US8382829B1 (en) 2008-03-10 2013-02-26 Mitralign, Inc. Method to reduce mitral regurgitation by cinching the commissure of the mitral valve
US8715342B2 (en) 2009-05-07 2014-05-06 Valtech Cardio, Ltd. Annuloplasty ring with intra-ring anchoring
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US10517719B2 (en) 2008-12-22 2019-12-31 Valtech Cardio, Ltd. Implantation of repair devices in the heart
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US8353956B2 (en) 2009-02-17 2013-01-15 Valtech Cardio, Ltd. Actively-engageable movement-restriction mechanism for use with an annuloplasty structure
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EP2775896B1 (fr) 2011-11-08 2020-01-01 Valtech Cardio, Ltd. Fonction d'orientation commandée d'un outil de pose d'implant
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EP3730084A1 (fr) 2012-10-23 2020-10-28 Valtech Cardio, Ltd. Fonction de direction contrôlée pour outil de pose d'implant
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Also Published As

Publication number Publication date
WO2010000454A1 (fr) 2010-01-07
EP2321069B1 (fr) 2017-11-01
ZA201100323B (en) 2012-03-28
ES2647563T3 (es) 2017-12-22

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